1 | Arthur |
Dent | Protagonist. |
| L. |
Prosser | An "only human", carbon-based bipedal life form - ape descended. |
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| Bypasses - Device that allows people to dash from Point A to Point B. |
| Ford |
Prefect | Hitchhiker pretending to be human. Trapped on Earth for 15 years. |
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| Betelguese - Ford's home system. |
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| Orion Beta - A star system. |
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| Janx Spirit - An alcoholic beverage that depresses telepsychic power. |
2 | |
| Pan Galactic Gargle Blaster - Best drink according to The Hitchhiker... |
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| Encyclopedia Galactica - Standard repository of all knowledge and wisdom, before the Hitchhiker's Guide supplanted it. |
| Barman |
| The bar man of the Horse and Groom. A dignified old man. |
3 | |
| Sub-Etha Sens-O-Matic - A small black device. |
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| Jaglan Beta - A planet. |
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| Santraginus V - Planet that is home to marble-sanded beaches.
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| Kakrafoon - A desert world. Another planet. |
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| Beast of Traal - A mind-boggingly stupid animal. |
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| The Vogons - One of the most unpleasant races in the Galaxy. |
| Prostetnic Vogon |
Jeltz | Vogon Civil Servant. Part of Galactic Hyperspace Planning Council. |
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| Alpha Centauri - Home to the Galactic Hyperspace Planning Council. |
4 | Zaphod |
Beeblebrox |
President - Imperial Galactic Government. Ford's "cousin". aka: Phil. |
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| Damogran - Secret home of Heart of Gold. An arranged planet. |
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| Easter Island - A small island on the planet of Damogran. |
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| France - The Heart of Gold island. |
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| Hooloovoo - A super-intelligent shade of the color blue. |
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| Damogran Frond Crested Eagle - An animal from Damogran. |
| Trillian |
| Humanoid girl Zaphod picked up. Arthur's friend. aka: Tricia McMillan. |
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| Heart of Gold - Starship. |
5 | |
| Megabrantis Cluster - The Political Hub of the Galaxy. |
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| Dentrassis - An unruly tribe of Gourmands. |
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| Dentrassi - The best cooks and drink mixers on the galaxy. |
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| Teasers - A group of rich kids Ford got a lift with to go to Earth. |
6 | |
| Babel Fish - A device-like creature that translates any form of language. |
7 | |
| Azgoths of Kria - A race with the second worst poetry in the Universe. |
| Paula Nancy |
Millstone Jennings |
Creator of the very worst poetry. |
8 | |
| Bethselamin - A fabulously beautiful planet. |
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| Alpha Proxima - Sol's nearest stellar neighbor. |
9 | |
| Poghril - A famine-struck land located in the Pansel System. |
10 | Marvin |
| The Paranoid Android. A robot. |
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| Sirius Cybernetics Corporation - Designs and Robots and machines. |
12 | Gag |
Halfrunt | Zaphod's private brain care specialist. |
14 | |
| Horsehead Nebula - A vast, dark cloud. |
15 | |
| Magrathea - Planet that specialized in custom-made luxury planet building. Formerly the Richest Planet before it disappeared. |
16 | Eddie |
| The shipboard computer. |
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| Soulianis and Rahm - Twin suns. |
17 | |
| Nutri-Matic Machine - Machine by Sirius Cybernetics Corporation that dispensed a drink that was almost entirely unlike tea. |
21 | Veet |
Voojagig | A quiet young student at the University of Maximegalon. |
22 | Slartibarfast |
| A Margathean who designed several planets. Assisted Arthur and Ford. |
25 | |
| Brockian Ultra Cricket - Curious game that involves hitting people. |
| Lunkwill |
| Soberly dressed programmer. Creator of Deep Thought alongside Fook. |
| Fook |
| A soberly dressed programmer. The creator of Deep Thought. |
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| Deep Thought - The second greatest computer in the Universe. |
| Majikthise |
| An old Philosopher. The representative of the Amalgamated Union of Philosophers, Sages, and Other Thinking Persons. |
| Vroomfondel |
| Majikthise's colleague. A philosopher. |
26 | Loonquawl |
| A descendant of Lunkwill who was trained to seek the answer to the Ultimate Question. |
| Phouchg |
| A descendant of Fook who was trained to seek the answer to the Ultimate Question. |
| Yooden |
Vranx | The Arcturan Captain. |
| Benji |
| Trillian's mouse from Earth. |
| Frankie |
| Trillian's mouse from Earth. |